06/10/2026
W**D WATCH WEDNESDAY, where we shine a spotlight on w**ds commonly found across Guernsey County.
Poison Hemlock (Conium maculatum) — If you’ve taken a drive down most roads in Guernsey County recently, you may have noticed a tall white flower growing. Chances are, that is Poison Hemlock. This highly invasive w**d is a biennial herb in the carrot family. In its first year, it forms a low basal rosette; by the second year, it bolts into a tall flowering plant that can reach up to 10 feet in height.
Poison Hemlock has several easy identification features. It has a smooth, hollow, hairless stem with distinctive purple or reddish blotches. The small white blooms form an umbrella‑shaped umbel. When the leaves are crushed, the plant gives off an unpleasant musty smell.
Poison Hemlock is most commonly found along roadsides and in disturbed soils, but if you take a quick look around, you’ll notice it is making its way into hay and pasture fields. This w**d is considered highly invasive and can be found in every county in Ohio. The seeds are easily distributed by animals, wind, and equipment. Seeds remain viable in the soil for 3–6 years, and a single plant can produce thousands of seeds—so early intervention is key to stopping the spread.
Why is Poison Hemlock so concerning? It poses a severe toxicity threat and a public health hazard to both humans and animals. If ingested, this plant is poisonous, and immediate medical care is required. There have been multiple cases where it has been mistakenly consumed due to its resemblance to edible plants such as wild carrot, parsley, and wild parsnip. Because of its toxicity and the risk of contact dermatitis, it is advisable to always wear proper PPE when handling Poison Hemlock.
Fun Fact: In ancient Greece, hemlock was used to poison condemned prisoners—Socrates being the most famous example.
For more information on Poison Hemlock or help identifying it on your property, please reach out to Guernsey Soil and Water for assistance.
Stay tuned for next week’s W**d Watch Wednesday, because every plant has a story—even the pesky ones!